As the United Kingdom's House of Lords began its two-day-long debate on marriage equality legislation Monday, thousands of supporters rallied outside the parliamentary chambers carrying signs, chanting slogans, and in the case of one group of musical misters, broke out into song.

The London Gay Men's Chorus was among those outside the Houses of Parliament, and upon discovering that members could hear singing voices inside the chamber, launched into a performance of Erasure's "A Little Respect."

The legislation being debated would enact marriage equality in England and Wales, allowing Britons the right to marry their same-sex partner. Parliament's other chamber, the House of Commons, gave final approval to the legislation in May.

Following the second reading in the House of Lords Monday and Tuesday, the legislation will be heard in committee, sent through the report stage, then return to the House of Lords for third reading — a process that could take several weeks — according to the British LGBT group Stonewall. If the legislation passes the House of Lords on third reading, it will then go to the queen for her signature, also known as Royal Assent.